mkdocs-material/src/partials/language.html

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<!-- Normalize language configuration -->
{% set languages = "en" %}
{% if config and config.theme %}
  {% set languages = config.theme.language | default("en") %}
{% endif %}
{% if languages is string %}
  {% set languages = languages.split(",") | map("trim") %}
{% endif %}

<!-- Import translations for given language -->
{% import "partials/language/" + (languages | first) + ".html" as lang %}

<!-- Re-export translations -->
{% macro t(key) %}{{ {
  "search.languages": languages | join(", ")
}[key] or lang.t(key) }}{% endmacro %}